Question

1. test scores, out of 100 points

92 84 95 77 74 80 95 70 66
73 68 90 78 64 72 78 76 65
59 71 77 92 91 89 74 76 90
frequency table:

interval

# of values

Explanation:

Step1: Determine intervals

Let's use intervals of 10: 50 - 59, 60 - 69, 70 - 79, 80 - 89, 90 - 99.

Step2: Count values in each interval

For 50 - 59: 1 (the value 59)
For 60 - 69: 4 (64, 65, 66, 68)
For 70 - 79: 12 (70, 71, 72, 73, 74, 74, 76, 76, 77, 77, 78, 78)
For 80 - 89: 4 (80, 84, 89)
For 90 - 99: 6 (90, 90, 91, 92, 92, 95, 95)

Answer:

Interval	# of values
60 - 69	4
70 - 79	12
80 - 89	4
90 - 99	6